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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56d0e0036e3d379ba1d4012a10e1979b6095ec6ed6c2832fea76aae2a54b7c68' 
  AND token = 'Dc2X5hILXZgZM9gqmYQd7f/x0A8H7RaXZKz7r7T1jqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}